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TESS Discovery of a Transiting Super-Earth in the pi Mensae System

Huang, Chelsea X. and Ciardi, David R. and Christiansen, Jessie L. (2018) TESS Discovery of a Transiting Super-Earth in the pi Mensae System. Astrophysical Journal Letters, 868 (2). Art. No. L39. ISSN 2041-8213. PMCID PMC6662726. doi:10.3847/2041-8213/aaef91.

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We report the detection of a transiting planet around π Men (HD 39091), using data from the Transiting Exoplanet Survey Satellite (TESS). The solar-type host star is unusually bright (V = 5.7) and was already known to host a Jovian planet on a highly eccentric, 5.7 yr orbit. The newly discovered planet has a size of 2.04 ± 0.05 R⊕ and an orbital period of 6.27 days. Radial-velocity data from the High-Accuracy Radial-velocity Planet Searcher and Anglo-Australian Telescope/University College London Echelle Spectrograph archives also displays a 6.27 day periodicity, confirming the existence of the planet and leading to a mass determination of 4.82 ± 0.85 M⊕. The star's proximity and brightness will facilitate further investigations, such as atmospheric spectroscopy, asteroseismology, the Rossiter–McLaughlin effect, astrometry, and direct imaging.

Item Type:Article
Related URLs:
URLURL TypeDescription CentralArticle Paper
Huang, Chelsea X.0000-0003-0918-7484
Ciardi, David R.0000-0002-5741-3047
Christiansen, Jessie L.0000-0002-8035-4778
Alternate Title:TESS Discovery of a Transiting Super-Earth in the π Mensae System
Additional Information:© 2018 The American Astronomical Society. Received 2018 September 16; revised 2018 November 7; accepted 2018 November 7; published 2018 November 30. We acknowledge the use of TESS Alert data, which is currently in a beta test phase, from the TESS Science Office and at the TESS Science Processing Operations Center. Funding for the TESS mission is provided by NASA's Science Mission directorate. This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. C.X.H., J.B., and M.N.G. acknowledge support from MIT's Kavli Institute as Torres postdoctoral fellows. A.V.'s work was performed under contract with the California Institute of Technology/Jet Propulsion Laboratory funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. J.A.D. and J.N.W. acknowledge support from the Heising–Simons Foundation. S.U., F.P., F.B., D.S., C.L., D.E., M. Marmier, and M. Mayor acknowledge financial support from the Swiss National Science Foundation (SNSF) in the frame work of the National Centre for Competence in Research Planets. D.E. acknowledges financial support from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program (project Four Aces; grant agreement 724427). N.N. acknowledges partial supported by JSPS KAKENHI grant No. JP18H01265 and JST PRESTO grant No. JPMJPR1775. D.D. acknowledges support provided by NASA through Hubble Fellowship grant HSTHF2-51372.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. We made use of the Python programming language and the open-source Python packages numpy (van der Walt et al. 2011), emcee (Foreman-Mackey et al. 2013), and celerite (Foreman-Mackey et al. 2017). Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant DNRF106). We acknowledge the traditional owners of the land on which the AAT stands, the Gamilaraay people, and pay our respects to elders past and present. Facility: TESS, ESO:3.6m, AAT.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Massachusetts Institute of Technology (MIT)UNSPECIFIED
Heising-Simons FoundationUNSPECIFIED
Swiss National Science Foundation (SNSF)UNSPECIFIED
European Research Council (ERC)724427
Japan Society for the Promotion of Science (JSPS)JP18H01265
Japan Science and Technology AgencyJPMJPR1775
NASA Hubble FellowshipHST-HF2-51372.001-A
Danish National Research FoundationDNRF106
Subject Keywords:planetary systems – planets and satellites: detection – stars: individual (HD 39091, TIC 261136679)
Issue or Number:2
PubMed Central ID:PMC6662726
Record Number:CaltechAUTHORS:20181207-082906305
Persistent URL:
Official Citation:Chelsea X. Huang et al 2018 ApJL 868 L39
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91544
Deposited By: Tony Diaz
Deposited On:07 Dec 2018 16:46
Last Modified:16 Feb 2022 23:22

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